Bump _data/popolo-data from `5499849` to `b15c673`
Bump _data/popolo-data from `5499849` to `b15c673`

Bumps [_data/popolo-data](https://github.com/SomethingNewUK/popolo-data) from `5499849` to `b15c673`.
- [Release notes](https://github.com/SomethingNewUK/popolo-data/releases)
- [Commits](https://github.com/SomethingNewUK/popolo-data/compare/54998490f2093d94eb06bf4d9901b0cbfc793099...b15c673f5d19c1ada21d7fa10e04cba8c2620e4e)

---
updated-dependencies:
- dependency-name: _data/popolo-data
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
SomethingNewUK/somethingnewuk.github.io,SomethingNewUK/somethingnewuk.github.io